I have some important new details to share on the upcoming Nikon full frame mirrorless camera:
The names of the two new Nikon full-frame cameras will be:
Nikon Z6: high speed, low light model (24MP)
Nikon Z7: high-resolution model (45MP)
The new Nikon mirrorless lenses could be called Z-Nikkor.
In the next official teaser or in the final press release, Nikon will greatly emphasize the inner diameter of the new mount.
via NikonRumors.com

Here are the rumored Nikon mirrorless camera specifications from NikonRumors:
Two full frame mirrorless cameras: one with 24-25MP and one with 45MP (48MP is also a possibility).
Similar body size to the Sony a7 camera but with better ergonomics and a better grip.
5-axis in-body stabilization
9fps
New mirrorless mount that will allow for f/0.95 lenses (see the NOCT trademark and f/0.9 lens patents).
Memory cards: XQD and CF Express (ProGrade is coming with a CF Express card).
EVF resolution: 3.6MP
Initially, three lenses will be announced: 24-70mm, 35mm and 50mm.
Pricing:
The 45MP model will be around $4,000/€4,000 in a kit with the 24-70mm lens.
The 25MP model will be under $3,000/€3,000 (also with a lens).
via NikonRumors

Nikon announced the development of a 500mm f/5.6E PF ED VR lens. This is the only information we have on the new lens:
Will offer a compelling combination of portability and performance
Significantly smaller and lighter than comparable predecessors
Phase Fresnel (PF) lens element
Light enough to use hand-held
via Photorumors.com

Nikon’s 2018 financial results are out: profits are up (76.2% operating profit increase for the imaging business) while the number of sold cameras is down. The 2019 forecast is similar - similar profit is expected for the Nikon Imaging Products Business with a decrease in unit sales across the board due to continuous market shrinkage.
via nikonrumors.com

The 2018 TIPA awards are out - Nikon got four awards including best professional DSLR camera for the D850 (see all the awards the D850 got):
Best DSLR Professional: Nikon D850
Best APS-C DSLR Expert: Nikon D7500
Best Professional Lens: Nikon AF-S Nikkor 180-400mm f/4E TC1.4Fl ED VR
Best Rugged Camera: Nikon Coolpix W300
The 2018 EISA awards are also out and the Nikon D7500 got the prosumer DSLR camera award.

This year Nikon will introduce a new Nikkor 600mm f/5.6 PF lens.
The new 600mm f/5.6 PF lens is also expected to be significantly lighter and cheaper compared to the current 600mm f/4 version that weights 134oz/3,8kg.
via Nikonrumors.com

Amazon: Nikon D850 will be in stock on March 13th
The Nikon D850 will be in stock at Amazon on March 13th according to an updated product listing - if you place an order today, you should get the camera next week.